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# frozen_string_literal: true require_relative 'uploaded_file' module Rack module Multipart class Generator def initialize(params, first = true) @params, @first = params, first if @first && !@params.is_a?(Hash) raise ArgumentError, "value must be a Hash" end end def dump return nil if @first && !multipart? return flattened_params unless @first flattened_params.map do \|name, file\| if file.respond_to?(:original_filename) if file.path ::File.open(file.path, 'rb') do \|f\| f.set_encoding(Encoding::BINARY) content_for_tempfile(f, file, name) end else content_for_tempfile(file, file, name) end else content_for_other(file, name) end end.join << "--#{MULTIPART_BOUNDARY}--\r" end private def multipart? query = lambda { \|value\| case value when Array value.any?(&query) when Hash value.values.any?(&query) when Rack::Multipart::UploadedFile true end } @params.values.any?(&query) end def flattened_params @flattened_params \|\|= begin h = Hash.new @params.each do \|key, value\| k = @first ? key.to_s : "[#{key}]" case value when Array value.map { \|v\| Multipart.build_multipart(v, false).each { \|subkey, subvalue\| h["#{k}[]#{subkey}"] = subvalue } } when Hash Multipart.build_multipart(value, false).each { \|subkey, subvalue\| h[k + subkey] = subvalue } else h[k] = value end end h end end def content_for_tempfile(io, file, name) length = ::File.stat(file.path).size if file.path filename = "; filename=\"#{Utils.escape_path(file.original_filename)}\"" <<-EOF --#{MULTIPART_BOUNDARY}\r content-disposition: form-data; name="#{name}"#{filename}\r content-type: #{file.content_type}\r #{"content-length: #{length}\r\n" if length}\r #{io.read}\r EOF end def content_for_other(file, name) <<-EOF --#{MULTIPART_BOUNDARY}\r content-disposition: form-data; name="#{name}"\r \r #{file}\r EOF end end end end